package org.jgs1904.map_004;

import java.util.ArrayList;
import java.util.HashMap;

/**
 * @author: 默苍璃
 * @date: 2024-11-03 21:53
 */
public class MapTest {

    public static void main(String[] args) {
        HashMap hashmap = new HashMap<>();

        hashmap.put("001", "张三");

        Object result = hashmap.put("001", "李四");
        System.out.println(result);



    }

}
